Polycarbonate composition

Patent metadata

Field	Value
Publication number	US-11718749-B2
Application number	US-201816650562-A
Country	US
Kind code	B2
Filing date	Aug 31, 2018
Priority date	Sep 28, 2017
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

The present invention relates to a polycarbonate composition and the process for the production thereof and molded articles. The polycarbonate composition provided in the present invention comprises A) 8-70 wt. % of a polycarbonate component, B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer component, C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X) and D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene, with the above weight percentages based on said polycarbonate composition as 100 wt. %. The polycarbonate composition provided in the present invention has a high flame-retardant level, an excellent low-temperature impact-resistant property and good heat resistance, and is suitable for the use requirement of casings for electrical devices which have relatively high flame-retardant levels (such as UL94 5VB) and require an excellent low-temperature impact-resistant property.

First claim

The invention claimed is:

1. A polycarbonate composition, comprising
A) 8-70 wt. % of a polycarbonate component,
B) 40-90 wt. % of a polysiloxane-polycarbonate copolymer component,
wherein the siloxane blocks of the polysiloxane-polycarbonate copolymer are derived from the corresponding dihydroxy polysiloxane (I):

wherein, in this formula (I),
R1 independently represents hydrogen atom, halogen atom, hydroxy group, alkyl group having 1 to 20 carbon atoms, alkoxy or aryl group;
R2 independently represents hydrocarbon group having 1 to 13 carbon atoms or hydroxy group;
R3 independently represents alkylene group having 2 to 8 carbon atoms;
m independently represents an integer of 0 to 4;
n independently represents an integer of 1 to 200;
A represents a structure of the following chemical formula (II):

X represents polynuclear arylene group which has 6 to 30 carbon atoms and is unsubstituted or substituted with halogen atom, alkyl group, alkoxy group, aryl group or carboxy group,

C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X)

wherein,
k represents 1 or an integer from 1 to 10,
having a trimer content (k=1) of from 60 to 98 mol %, based on component C,
and wherein,
R is in each case identical or different and represents an amine group; C 1 - to C 8 -alkyl, each optionally halogenated; C 1 - to C 8 -alkoxy; C 5 - to C 6 -cycloalkyl, each optionally substituted by alkyl, and/or by halogen; C 6 - to C 20 -aryloxy, each optionally substituted by alkyl, and/or by halogen, and/or by hydroxy; C 7 - to C 12 -aralkyl, each optionally substituted by alkyl, and/or by halogen; or a halogen group; or an OH group, and
D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene,
with the above weight percentages based on said polycarbonate composition as 100 wt. %.

2. The polycarbonate composition according to claim 1 , wherein, said polysiloxane-polycarbonate copolymer comprises 4-10 wt. % of siloxane units, based on said polysiloxane-polycarbonate copolymer as 100 wt. %.

3. The polycarbonate composition according to claim 1 , wherein, the content of said trimer (k=1) is 65 to 95 mol % based on component C.

4. The polycarbonate composition according to claim 3 , wherein, the content of said trimer (k=1) is 65-85 mol %, the content of said tetramers (k=2) is from 10 to 20 mol %, the content of the higher oligophosphazenes (k=3, 4, 5, 6 and 7) is from 5 to 15 mol %, and the content of the phosphazene-oligomers with k≥8 is from 0 to 1 mol %, each based on component C.

5. The polycarbonate composition according to claim 1 , wherein, said cyclic phosphazene is one or more selected from the group consisting of propoxyphosphazene, phenoxyphosphazene, methylphenoxyphosphazene, aminophosphazene and fluoroalkylphosphazene.

6. The polycarbonate composition according to claim 1 , wherein, said methyl methacrylate-butadiene-styrene has butadiene or butadiene-styrene copolymer as the rubber phase, of which the weight percent is 60-85 wt. %, based on said methyl methacrylate-butadiene-styrene as 100 wt. %.

7. The polycarbonate composition according to claim 1 , wherein, said methyl methacrylate-butadiene-styrene has PMMA or PMMA-styrene copolymer as the graft layer.

8. The polycarbonate composition according to claim 1 , further comprising a component E) 0.05-1 wt. % of an anti-dripping agent, based on said polycarbonate composition as 100 wt. %.

9. The polycarbonate composition according to claim 1 , further comprising lubricants, demolding agents, nucleating agents, stabilizers, antistatic agents, dyes, pigments, fillers, or reinforcing agents.

10. A method comprising utilizing the polycarbonate composition according to claim 1 in the preparation of injection- or thermo-formed molded articles.

11. Molded articles, prepared from the polycarbonate composition according to claim 1 .

12. A process for the preparation of a polycarbonate composition, comprising the following steps:
mixing components for the preparation of said polycarbonate composition, said components including:
A) 8-70 wt. % of a polycarbonate component,
B) 40-90 wt. % of a polysiloxane-polycarbonate copolymer component,
wherein the siloxane blocks of the polysiloxane-polycarbonate copolymer are derived from the corresponding dihydroxy polysiloxane (I):

wherein, in this formula (I),
R1 independently represents hydrogen atom, halogen atom, hydroxy group, alkyl group having 1 to 20 carbon atoms, alkoxy or aryl group;
R2 independently represents hydrocarbon group having 1 to 13 carbon atoms or hydroxy group;
R3 independently represents alkylene group having 2 to 8 carbon atoms;
m independently represents an integer of 0 to 4;
n independently represents an integer of 1 to 200;
A represents a structure of the following chemical formula (II):

X represents polynuclear arylene group which has 6 to 30 carbon atoms and is unsubstituted or substituted with halogen atom, alkyl group, alkoxy group, aryl group or carboxy group,

C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X)

wherein,
k represents 1 or an integer from 1 to 10,
having a trimer content (k=1) of from 60 to 98 mol %, based on component C, and wherein
R is in each case identical or different and represents an amine group; C 1 - to C 8 -alkyl, each optionally halogenated; C 1 - to C 8 -alkoxy; C 5 - to C 6 -cycloalkyl, each optionally substituted by alkyl, and/or by halogen; C 6 - to C 20 -aryloxy, each optionally substituted by alkyl, and/or by halogen, and/or by hydroxy; C 7 - to C 12 -aralkyl, each optionally substituted by alkyl, and/or by halogen; or a halogen group; or an OH group, and
D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene,
with the above weight percentages based on said polycarbonate composition as 100 wt. %.

13. A polycarbonate composition, consisting of:
A) 8-70 wt. % of a polycarbonate component,
B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer component,
C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X)

wherein,
k represents 1 or an integer from 1 to 10,
having a trimer content (k=1) of from 60 to 98 mol %, based on component C,
and wherein,
R is in each case ide

Assignees

• Covestro Deutschland Ag

Inventors

• Huang Zhenyu
• Han Hao

Classifications

• C08L69/00 Primary

  Compositions of polycarbonates; Compositions of derivatives of polycarbonates · CPC title

• C08G64/186

  containing polysiloxane sequences · CPC title

• C08K5/5399

  Phosphorus bound to nitrogen · CPC title

• C08L83/10

  Block- or graft-copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C08L51/08, C08L53/00) · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title